pratt



(Nn Model.)

' N. W. PRATT.

STEAM GENERATOR.

No. 565,029. Patented Aug. 4, i896.

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UNITED STATES PATENT OEEICE.

NAT W'. PRATT, OF BROOKLYN, NEV YORK, ASSIGNOR TO THE BABCOCK & VVILCOXCOMPANY, OF NEV YORK, N. Y.

STEAM-c E'NERATOR.

SPECIFICATION forming part of Letters Patent No. 565,029, dated August4, 1896. Application iiled November 23,1895. Serial No. 669,892. (Nomodel.)

To a/ZZ whom it may concern.-

Be it known that I, NAT WV. PRATT, a citizen of the United States,residing in the city of Brooklyn, county of Kings, and State of NewYork, have invented certain new and useful Improvements inSteam-Generators, of which the following is a specification.

The invention consists in protecting the rear header of a sectionalsteam-boiler from burning out by means of a bafiieplate of inasonry orother suitable material, which is located between said header and thecombustion-chamber of the generator.

It also consists in providing the convex front head of the steam andwater drum with an integral countersunk portion which eX- tends acrosssaid head and furnishes a rightangular iiat bearing for the tubes thatconnect the drum with the front headers of the sectional boiler, wherebythe bending of said tubes to secure such a bearing upon a roundedsurface is avoided; and it further consists in providing such drumheadwith a struck-up integral shoulder to support one end of the steam-pipein the drum, and in furnishing the body of the drum with a struck-upintegral neck to receive the steam-pipe connection, all as hereinafterdescribed and claimed.

In the accompanying drawings, Figure 1 represents the improved sectionalsteam-generator and its setting in partial front elevation and inpartial vertical transverse section on line X X of Fig. 2. Fig. 2 showsa vertical longitudinal section of the same on line Y Y of Fig. 1. Fig.3 represents a rear elevation of the same with a portion of the settingremoved, showing a rear view of the sectional boiler'and of thebathe-plate. Fig. i represents a top view of the steam and water drumand a top view of the front portion of the sectional boiler, a part ofthe setting being removed in order that the boiler may be seen.

A A A denote groups of generating watertubes which compose the sectionalboiler, and are connected at the front end to a vertical header B and atthe rear end to a vertical header C.

D denotes the furnace of the generator, and E the combustion-chamberabove the saine.

In generators as ordinarily constructed the rear header is unprotectedfrom the flames and heated gases which rise through thecoinbustion-chamber, and are driven into contact with said header by thecourse of the draft. Said header, therefore, burns out after awhile andanother has to be substituted at considerable expense and loss of time.In order to avoid this disagreeable result, I construct a baiiie-plateF, of masonry or other suitable material, in front of the rear header C,between it and the combustion-chamber, the said plate surrounding thetubes of the boiler, as particularly shown in Fig. 2. This bafde platemaybe supported upon the bridge-wall G and be tied into the side wallsGr of the setting. The rising flames and heated gases, instead ofimpinging upon the header, therefore, will be kept from contacttherewith by the baie-plate, which isolates the header from thecombustion-chamber and preserves the header against being burned out ordarnaged by the heat.

H denotes the steam and water drum, which is of wrought metal, surmountsthe generating water-tubes, and is connected to the rear header by pipesI and to an extension b of the front header by a horizontal row of pipesJ. The front of this drum is convex in shape, being a portion of thesurface of a sphere, and in connecting the pipes J to such curved frontthey have been bent at their inner ends, at considerable expense, so asto produce a rightn angular bearing between them and the drumhead. Theobject of this portion of my invention is to avoid such bending of thepipes, and this I secure by countersinking the head horizontally at K,so as to produce a 4liat face 7a integral with the head, which extendsacross the head, as shown in Fig. 1, and will be at right angles to thelongitudinal axes of the straight pipes J, as shown in Fig. 4:.

To furnish a support for the interior end of the surface-pipe L withoutusing an applied bracket or ledge constitutes another feature of theinvention, and such a support I secure by forming a bulge M on the fronthead, so as to provide a shoulder fm, upon which said pipe end can rest.

The remaining feature of the invention consists in forming upon theupper surface of the cylindrical body of the drum a struck-up in- IOC)tegral neck N for the reception of the flanged steam-pipe connection O,which enables said steam-pipe connection to be applied more easily andwith a more perfect joint, besides lessenng the expense of construction.

Vhat I claim, and desire to secure by Letters Patent, is-

l. In a sectional steam-gen erator, having a series of Water-tubesconnected to front and rear headers, a battle-plate surrounding saidtubes and located Within the combustionohamber at the front of the rearheader, whereby the header is isolated from the chanr ber and protectedfrom the intense heat of the impin gin g gases,substantially as setforth.

